The "/builtin" page:

URL: builtin/FILENAME
Return the built-in text given by FILENAME. This is used internally
by many Fossil web pages to load built-in javascript files.
If the id= query parameter is present, then Fossil assumes that the
result is immutable and sets a very large cache retention time (1 year).

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Fossil 2.7 [869841cb04] 2018-12-12 20:03:50